A problem with current food service robots is making the robots safe to work around food. A solution provided by the present disclosure is a food-safe tool switcher and corresponding tool. The tool switcher can mate with a variety of tools, which can be molded or 3D printed out of food-safe materials into a single-part, instead of constructed modularly. This provides for easier cleaning.
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1. A system comprising:
an actuating rod;
at least one ball bearing;
a housing having a first port to receive the actuating rod, and having a second port within the first port to receive the at least one ball bearing, the first port and second port of the housing configured to allow motion of the actuating rod in a direction through the first port perpendicular to the at least one ball bearing in the second port, a distal end of the second port further having a hole with a constriction on the outer circumference of the housing, the constriction configured to allow a portion of the ball bearing to extend out of the second port while holding the remaining portion of the ball bearing within the second port;
a utensil mating bracket having a reception port configured to receive the housing, the reception port having at least one locking member along an outer portion of the reception port, such that when the portion of the at least one ball bearing extends out of the second port, the locking member interfaces with the portion of the at least one ball bearing such that the housing is locked within the utensil mating bracket.
10. A method comprising:
providing an actuating rod, at least one ball bearing, and a housing;
receiving the actuating rod at a first port of the housing;
receiving, at a second port within the first port, the at least one ball bearing;
wherein the first port and second port of the housing are configured to allow motion of the actuating rod in a direction through the first port perpendicular to the at least one ball bearing in the second port, a distal end of the second port further having a hole with a constriction on the outer circumference of the housing, the constriction configured to allow a portion of the ball bearing to extend out of the second port while holding the remaining portion of the ball bearing within the second port;
receiving the housing at a utensil mating bracket having a reception port, the reception port having at least one locking member along an outer portion of the reception port, such that when the portion of the at least one ball bearing extends out of the second port, the locking member interfaces with the portion of the at least one ball bearing such that the housing is locked within the utensil mating bracket.
2. The system of
a compression spring within the housing, the compression spring coupled with the actuating rod.
3. The system of
4. The system of
5. The system of
the at least one ball bearing is at least two ball bearings,
the housing includes a third port within the first port to receive a second of the at least two ball bearings, the third port of the housing configured to allow motion of the second ball bearing perpendicular to the motion of the actuating rod in the first port, a distal end of the third port further having hole with a constriction on the outer circumference of the housing, the constriction configured to allow a portion of the second ball bearing to extend out of the third port while holding the remaining portion of the second ball bearing within the third port;
wherein when the portion of the second ball bearing extends out of the third port, the locking member interfaces with the portion of the at least one ball bearing such that the housing is locked within the utensil mating bracket.
6. The system of
8. The system of
9. The system of
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This application claims the benefit of U.S. Provisional Application No. 62/730,703, filed on Sep. 13, 2018, U.S. Provisional Application No. 62/730,947, filed on Sep. 13, 2018, U.S. Provisional Application No. 62/730,933, filed on Sep. 13, 2018, U.S. Provisional Application No. 62/730,918, filed on Sep. 13, 2018, U.S. Provisional Application No. 62/730,934, filed on Sep. 13, 2018 and U.S. Provisional Application No. 62/731,398, filed on Sep. 14, 2018.
This application is related to U.S. patent application Ser. No. 16/570,100, U.S. patent application Ser. No. 16/570,855, U.S. patent application Ser. No. 16/571,003, U.S. patent application Ser. No. 16/570,915, U.S. patent application Ser. No. 16/570,976, U.S. patent application Ser. No. 16/570,736, U.S. patent application Ser. No. 16/571,025, U.S. patent application Ser. No. 16/570,606, U.S. patent application Ser. No. 16/571,040, and U.S. patent application Ser. No. 16/571,041, all filed on the same day, Sep. 13, 2019.
The entire teachings of the above applications are incorporated herein by reference.
Traditionally, quick service food restaurants (fast food) employs humans assembling ingredients from pre-prepared bins or containers into a meal. Robots have not yet been able to assemble meals from prepared ingredients as a whole.
In embodiments, the below disclosure solves problems in relation to employing a food-safe tool changer in the quick service fast food restaurant environment. This device must enable a robot to detach and attach a variety of different tools for use in assembling and processing ingredients to prepare recipes. In order to effectively use a tool, the robot must have a rigid and geometrically deterministic interface between the tool and the robot. If the tool is not located where the programmer intended it to be, the robot will use the tool incorrectly when attempting to accomplish a task. The tool may collide with other objects in the workspace, as collision detection is performed using a geometric model of the robot and the tool, requiring an accurate attachment between the tool and the robot.
In an embodiment, a system includes an actuating rod, at least one ball bearing, and a housing having a first port to receive the actuating rod, and having a second port within the first port to receive the at least one ball bearing. The first port and second port of the housing are configured to allow motion of the actuating rod in a direction through the first port perpendicular to the at least one ball bearing in the second port. A distal end of the second port further has a hole with a constriction on the outer circumference of the housing. The constriction is configured to allow a portion of the ball bearing to extend out of the second port while holding the remaining portion of the ball bearing within the second port. The system further includes a utensil mating bracket having a reception port configured to receive the housing. The reception port having at least one locking member along an outer portion of the reception port, such that when the portion of the at least one ball bearing extends out of the second port, the locking member interfaces with the portion of the at least one ball bearing such that the housing is locked within the utensil mating bracket.
In an embodiment, the system further includes a compression spring within the housing. The compression spring is coupled with the actuating rod.
In an embodiment, the actuating rod is configured to extend through the housing such that it forces the at least one ball bearing through the second port such that the portion of the ball bearing extends out of the second port.
In an embodiment, the first port and second port have consistent diameters throughout lengths of the respective first and second ports.
In an embodiment, the at least one ball bearing is at least two ball bearings. The housing includes a third port within the first port to receive a second of the at least two ball bearings. The third port of the housing is configured to allow motion of the second ball bearing perpendicular to the motion of the actuating rod in the first port. A distal end of the third port further has hole with a constriction on the outer circumference of the housing. The constriction is configured to allow a portion of the second ball bearing to extend out of the third port while holding the remaining portion of the second ball bearing within the third port. When the portion of the second ball bearing extends out of the third port, the locking member interfaces with the portion of the at least one ball bearing such that the housing is locked within the utensil mating bracket.
In an embodiment, the utensil mating bracket further includes an actuator port configured to receive an actuator. The actuator can be a rotary actuator. The actuator can be configured to actuate a tool coupled with the utensil mating bracket. The actuator port can be a pneumatic port configured to provide air pressure to the tool in response to a command.
In an embodiment, a method includes providing an actuating rod, at least one ball bearing, and a housing. The method further includes receiving the actuating rod at a first port of the housing. The method further includes receiving, at a second port within the first port, the at least one ball bearing. The first port and second port of the housing are configured to allow motion of the actuating rod in a direction through the first port perpendicular to the at least one ball bearing in the second port. A distal end of the second port further has a hole with a constriction on the outer circumference of the housing. The constriction is configured to allow a portion of the ball bearing to extend out of the second port while holding the remaining portion of the ball bearing within the second port. The method further includes receiving the housing at a utensil mating bracket having a reception port. The reception port has at least one locking member along an outer portion of the reception port, such that when the portion of the at least one ball bearing extends out of the second port. The locking member can interface with the portion of the at least one ball bearing such that the housing is locked within the utensil mating bracket.
The foregoing will be apparent from the following more particular description of example embodiments, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating embodiments.
A description of example embodiments follows.
Operating a robot in a food preparation environment, such as a quick service restaurant, can be challenging for several reasons. First, the end effectors (e.g., utensils), that the robot uses need to remain clean from contamination. Contamination can include allergens (e.g., peanuts), dietary preferences (e.g., contamination from pork for a vegetarian or kosher customer), dirt/bacteria/viruses, or other non-ingestible materials (e.g., oil, plastic, or particles from the robot itself). Second, the robot should be operated within its design specifications, and not exposed to excessive temperatures or incompatible liquids, without sacrificing cleanliness. Third, the robot should be able to manipulate food stuffs, which are often fracturable and deformable materials, and further the robot must be able to measure an amount of material controlled by its utensil in order to dispense specific portions. Fourth, the robot should be able to automatically and seamlessly switch utensils (e.g., switch between a ladle and salad tongs). Fifth, the utensils should be adapted to be left in an assigned food container and interchanged with the robot as needed, in situ. Sixth, the interchangeable parts (e.g., utensils) should be washable and dishwasher safe. Seventh, the robot should be able to autonomously generate a task plan and motion plan(s) to assemble all ingredients in a recipe, and execute that plan. Eighth, the robot should be able to modify or stop a motion plan based on detected interference or voice commands to stop or modify the robot's plan. Ninth, the robot should be able to minimize the applied torque based on safety requirements or the task context or the task parameters (e.g., density and viscosity) of the material to be gathered. Tenth, the system should be able to receive an electronic order from a user, assemble the meal for the user, and place the meal for the user in a designated area for pickup automatically with minimal human involvement.
The food preparation area 102 includes a plurality of ingredient containers 106a-d each having a particular foodstuff (e.g., lettuce, chicken, cheese, tortilla chips, guacamole, beans, rice, various sauces or dressings, etc.). Each ingredient container 106a-d stores in situ its corresponding ingredients. Utensils 108a-d may be stored in situ in the ingredient containers or in a stand-alone tool rack 109. The utensils 108a-d can be spoons, ladles, tongs, dishers (scoopers), spatulas, or other utensils. Each utensil 108a-e is configured to mate with and disconnect from a tool changer interface 112 of a robot arm 110. While the term utensil is used throughout this application, a person having ordinary skill in the art can recognize that the principles described in relation to utensils can apply in general to end effectors in other contexts (e.g., end effectors for moving fracturable or deformable materials in construction with an excavator or backhoe, etc.); and a robot arm can be replaced with any computer controlled actuatable system which can interact with its environment to manipulate a deformable material. The robot arm 110 includes sensor elements/modules such as stereo vision systems (SVS), 3D vision sensors (e.g., Microsoft Kinect™ or an Intel RealSense™), LIDAR sensors, audio sensors (e.g., microphones), inertial sensors (e.g., internal motion unit (IMU), torque sensor, weight sensor, etc.) for sensing aspects of the environment, including pose (i.e., X, Y, Z coordinates and roll, pitch, and yaw angles) of tools for the robot to mate, shape and volume of foodstuffs in ingredient containers, shape and volume of foodstuffs deposited into food assembly container, moving or static obstacles in the environment, etc.
To initiate an order, a patron in the patron area 120 enters an order 124 in an ordering station 122a-b, which is forwarded to a network 126. Alternatively, a patron on a mobile device 128 can, within or outside of the patron area 120, generate an optional order 132. Regardless of the source of the order, the network 126 forwards the order to a controller 114 of the robot arm 110. The controller generates a task plan 130 for the robot arm 110 to execute.
The task plan 130 includes a list of motion plans 132a-d for the robot arm 110 to execute. Each motion plan 132a-d is a plan for the robot arm 110 to engage with a respective utensil 108a-e, gather ingredients from the respective ingredient container 106a-d, and empty the utensil 108a-e in an appropriate location of a food assembly container 104 for the patron, which can be a plate, bowl, or other container. The robot arm 110 then returns the utensil 108a-e to its respective ingredient container 106a-d, the tool rack 109, or other location as determined by the task plan 130 or motion plan 132a-d, and releases the utensil 108a-d. The robot arm executes each motion plan 132a-d in a specified order, causing the food to be assembled within the food assembly container 104 in a planned and aesthetic manner.
Within the above environment, various of the above described problems can be solved. The environment 100 illustrated by
Tool changers allow one mechanical robot or robot arm to exchange end effectors, and therefore be used for a variety of different purposes. For example, a robot arm with the ability to change end effectors can both grab an item with a claw and scoop an item with a scooper tool. The industry standard for tool changers does not provide product lines or models targeted at the food service industry, however. Available tool changer masters typically employ a metallic design for higher load industrial applications.
The present disclosure describes a food-safe tool changer that is constructed from low-load, food-safe materials. The disclosure further provides a degree of compliance to allow some misalignment when tool mating, which assists with automated tool mating. The invention further provides a food-safe shield to any accoutrements aimed at assisting the functionality of the tool changer master. A food-safe tool changer does not discard materials/shavings into the food, does not user non-edible lubricants, and all materials used are non-poisonous and/or edible.
For a robot arm to perform a task are traditionally configured with a specialized tool mounted to the end of the arm, referred to as an end-effector. Tasks also usually require more than one tool, and robots often are equipped with a flange that allows rapidly exchanging end-effectors. The flange is known as a tool-changer (see ATI Industrial Automation, etc.). Tool-changers are usually stiff, mechanically robust, able to be locked and un-locked using a remote actuation mechanism, and compatible with the environmental requirements of the task. In the restaurant embodiments of the present disclosure, the environmental requirements include being wash-down compatible food safe, and able to handle high temperatures, and other food-specific requirements.
Tool-changing has been around for as long as machine tools. Many tool changing standards currently exist for CNC (computer numerical control) machines with automatic tool changers (ATC).
Due to challenges of programming robot motion, much of the task complexity is often placed in the end-effector. Therefore, end-effectors are often complicated and contain many actuatable mechanisms and sensors. For the end-effectors to be exchangeable, existing tool changers contain a single mechanical locking mechanism and many pneumatic and electrical signal carrying accoutrements to pass to the tool.
Due to their complexity, these tools are expensive to develop and manufacture at scale. The goal of the present disclosure is to enable tool changing between tools that require actuation, without needing an actuator to be packaged on the tool side. Such a design removes complexity from each tool by adding features to the tool-changer master (e.g., the component which remains attached to the robot). The disclosed invention adds a nested configurable drive shaft with rotational capabilities that is linked to a linear shaft which actuates the locking mechanism, in a similar fashion to existing tool-changers. This approach replaces electrical and pneumatic feedthroughs with a single additional mechanical connection, which reduces the tool complexity and thus drastically reducing the cost of the tool side implements. In effect, this approach enables robot to employ tools that are more replaceable or disposable, economically in-line with traditional kitchen utensils (e.g., spatulas, tongs, dishers, and spoons).
In addition to the problem described above, the industry standard for tool changers does not contain a product line targeted at the food service industry. Available tool changer masters typically utilize materials that are not food-safe and are not protected against foreign material ingress (e.g., food clogging the mechanism). The invention described is constructed from food-safe materials and contains various sealing features that protect from ingress and enable wash-down cleaning.
The present disclosure illustrates and describes two tool changer designs below. A first design is illustrated in
The second design is illustrated in
While the first and second tool changer design are described as above, a person having ordinary skill in the art may combine various features described herein of both designs into other designs to create other tool changer designs.
Following
The teachings of all patents, published applications and references cited herein are incorporated by reference in their entirety.
While example embodiments have been particularly shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the embodiments encompassed by the appended claims.
Johnson, David M. S., Chu, Cody, Rooney, Justin, Trueba, Luis
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